Douself digital distance meter has high accuracy and wide measuring range up to 40m, automatic calculation of area and volume, indirect measurement by pythagorean theorem, easy addition / subtraction of measurement, set up front / rear benchmark, easy targeting with bright laser pointer, large LCD with backlight illumination and multi-line display, 99 data records and recall function, bubble level equipped as a spirit level tool, auto correction and error report technology, battery status indication, automatic / manual power off function, IP54 protection dust & splash proof, compact and handheld design.